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- Question 1 of 16
##### 1. Question

Given a seismic wavelet w = { 6, -4, -2 } and reflectivity series r = { 0, 1, 0 }, the corresponding seismic trace is ___________.

CorrectIncorrect - Question 2 of 16
##### 2. Question

Assertion (a): The inverse of a minimum phase wavelet is causal and stable.

Reason (r): The Z-transform of a minimum phase wavelet has all its zeros outside the unit circle.CorrectIncorrect - Question 3 of 16
##### 3. Question

The value of free-air correction (assuming sea level as datum plane) at an elevation of 150 m is _________ mGal.

CorrectIncorrect - Question 4 of 16
##### 4. Question

Match the items (listed in Group I) with the corresponding corrections applied for reduction of marine gravity data (listed in Group II).

Group I Group II

P. Effect of rotating homogeneous ellipsoidal Earth 1.Drift correction

Q. Effect of deficit mass from mean sea level to average depth 2. Latitude correction to ocean floor

R. Effect of relative motion of ship with respect to revolving Earth 3. Bouguer correction

S. Effect of elastic creep of gravimeter spring system 4. Eotvos correction and Earth tidesCorrectIncorrect - Question 5 of 16
##### 5. Question

Which one of the following Natural Remanent Magnetization (NRM) gives a primary, stable magnetization for igneous rocks?

CorrectIncorrect - Question 6 of 16
##### 6. Question

Which one of the following is the ray path for the P-wave that converts to S-wave while passing through the solid inner core?

CorrectIncorrect - Question 7 of 16
##### 7. Question

Which one of the following statements is CORRECT for the stress drop of an earthquake?

CorrectIncorrect - Question 8 of 16
##### 8. Question

The energy released by an earthquake of magnitude 7 is ________ times the energy released by an earthquake of magnitude 4 (use Kanamori’s formula).

CorrectIncorrect - Question 9 of 16
##### 9. Question

In resistivity logging using a ‘Normal device’, the distance between electrodes A and M is 0.40 m. If 20 mA current generates 10 mV potential, the apparent resistivity of the layer between the electrodes is _________ Ωm. (Use π = 3.14)

CorrectIncorrect - Question 10 of 16
##### 10. Question

A cylindrical sandstone core sample of diameter 0.02 m and length 0.04 m is fully saturated with brine solution of resistivity 0.5 Ωm. The resistance of the saturated sample measured in the laboratory is 500 Ω. The formation factor of the sample is __________. (Use π = 3.14)

CorrectIncorrect - Question 11 of 16
##### 11. Question

A Schlumberger array with current electrode separation 50 m and potential electrode separation 5 m is placed over an inhomogeneous medium. If the measured potential difference is 50 mV and the computed apparent resistivity is 100 Ωm, then the magnitude of current passing through the subsurface is _________ mA. (Use π = 3.14)

CorrectIncorrect - Question 12 of 16
##### 12. Question

Two horizontal layers have resistivities and thicknesses of 10 Ωm, 5m and 50 Ωm, 10m, respectively. If the two layers are reduced to a single layer, then the coefficient of electrical anisotropy will be

CorrectIncorrect - Question 13 of 16
##### 13. Question

How are the numerical values of the real and imaginary components of the impedance tensor (Z) in Magnetotelluric (MT) method related over a homogeneous half-space?

CorrectIncorrect - Question 14 of 16
##### 14. Question

The strike of a 2-D geological structure is in Y-direction. From the following options, choose the field components required to compute the apparent resistivity in E-Polarization mode for plane wave electromagnetic signals.

CorrectIncorrect - Question 15 of 16
##### 15. Question

Dip angle electromagnetic methods are suitable to delineate

CorrectIncorrect - Question 16 of 16
##### 16. Question

The fraction of a radioactive nuclide remaining after 10 half-lives is closest to

CorrectIncorrect